class_docstr: Logging in tensorboard without tensorflow ops.
  
  Simple example on how to log scalars and images to tensorboard without tensor ops.
  License: Copyleft
  
  __author__ = "Michael Gygli"
docstr: Creates a summary writer logging to logdir.
docstr_tok: ["Creates","a","summary","writer","logging","to","logdir","."]
code: def __init__(self, logdir):
      """Creates a summary writer logging to logdir."""
      self.writer = tf.summary.FileWriter(logdir)
  
imports: import csv
  import numpy
  import tensorflow
  import os
  import six
label_desc: Use image node_id 1 to create a new Summary object from inherited base classes: object with example: obj = Summary(logdir)